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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf99175b12829992fa84169f5bede8e4296ef354bede02406073168e0a3ac635' 
  AND token = 'hFbR78vsQiCvWy16a9kGMoZr6xYh6veQzlOL9+zdrBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}